The ancient empire known for its horse archers is the Mongol Empire. Founded by Genghis Khan in the early 13th century, the Mongols utilized highly mobile cavalry units skilled in horse archery, allowing them to conquer vast territories across Asia and Europe. Their military tactics included rapid mobility and the ability to shoot arrows accurately while riding at high speeds. This effective use of horse archers contributed significantly to their success on the battlefield, enabling them to establish one of the largest contiguous empires in history, stretching from Eastern Europe to the Sea of Japan.